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[172.10.233.147]) by smtp.gmail.com with ESMTPSA id w124sm853165oiw.40.2021.02.08.14.54.22 (version=TLS1 cipher=ECDHE-ECDSA-AES128-SHA bits=128/128); Mon, 08 Feb 2021 14:54:23 -0800 (PST) Date: Mon, 8 Feb 2021 14:54:20 -0800 (PST) From: Hugh Dickins X-X-Sender: hugh@eggly.anvils To: Seth Forshee cc: Andrew Morton , Chris Down , Amir Goldstein , Richard Henderson , Ivan Kokshaysky , Matt Turner , "Kirill A. Shutemov" , linux-mm@kvack.org, linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH] tmpfs: disallow CONFIG_TMPFS_INODE64 on alpha In-Reply-To: <20210208215726.608197-1-seth.forshee@canonical.com> Message-ID: References: <20210208215726.608197-1-seth.forshee@canonical.com> User-Agent: Alpine 2.11 (LSU 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Stat-Signature: o93zkh8ayphh8m7usajreb3rmuhcu8hp X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 47EAF80191DF Received-SPF: none (google.com>: No applicable sender policy available) receiver=imf08; identity=mailfrom; envelope-from=""; helo=mail-ot1-f44.google.com; client-ip=209.85.210.44 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1612824864-322956 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, 8 Feb 2021, Seth Forshee wrote: > As with s390, alpha is a 64-bit architecture with a 32-bit ino_t. > With CONFIG_TMPFS_INODE64=y tmpfs mounts will get 64-bit inode > numbers and display "inode64" in the mount options, whereas > passing "inode64" in the mount options will fail. This leads to > erroneous behaviours such as this: > > # mkdir mnt > # mount -t tmpfs nodev mnt > # mount -o remount,rw mnt > mount: /home/ubuntu/mnt: mount point not mounted or bad option. > > Prevent CONFIG_TMPFS_INODE64 from being selected on alpha. > > Fixes: ea3271f7196c ("tmpfs: support 64-bit inums per-sb") > Cc: stable@vger.kernel.org # v5.9+ > Signed-off-by: Seth Forshee Thanks, Acked-by: Hugh Dickins > --- > fs/Kconfig | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/Kconfig b/fs/Kconfig > index 3347ec7bd837..da524c4d7b7e 100644 > --- a/fs/Kconfig > +++ b/fs/Kconfig > @@ -203,7 +203,7 @@ config TMPFS_XATTR > > config TMPFS_INODE64 > bool "Use 64-bit ino_t by default in tmpfs" > - depends on TMPFS && 64BIT && !S390 > + depends on TMPFS && 64BIT && !(S390 || ALPHA) > default n > help > tmpfs has historically used only inode numbers as wide as an unsigned > -- > 2.29.2